Power-driven dry shaver



POWER DRIVEN DRY SHAVER Filed April 30, 1945 INVENTOR" Patented Apr. 20, 1948 UNITED STATES PATENT OFFICE POWER-DRIVEN nay smivrm Herbert E. Page, Alhambra, Calif.

Application April to, 1945, Serial No. scopes 30laims. 1

This invention relates to improvements in power driven dry shavers of the type employing a perforated cylindrical outer cutter head mounted for free rolling movement over the skin of the user and a rotatably driven inner cutter head mounted in the outer cutter head. Such a shaver is shown in my issued United States Letters Patent No. 2,355,672.

In such shavers the power driven inner cutter necessarily engages the inner surface of the outer cutter with enough friction to insure a close cutting of the whiskers projecting through the perforations in the outer cutter head and consequently there is a tendency for the inner cutter head to drag the outer cutter head along with it in its rotation. The rotation is at relatively high speed, say, of the order of 3,600 R. P. M. or over, and consequently when the outer head is first placed against the skin of the, user, it is rotating with the inner cutter at such high speed that skin burn is apt to result.

It is an object of the present invention to overcome this difliculty and to provide a shaver of this general type wherein the inner cutter head is so constructed and operated that, in its rotation, it does not drag or cause rotation of the freely rotatable outer cutter head.

More specifically. it is an object of the present invention to provide a shaver of this type wherein the inner cutter head is composed of two separate, coaxial cutter elements disposed end to end and simultaneously driven in opposite directions.

Additional objects and advantages will appear from the following description of specific embodiments of the invention, for which purpose I shall refer to the accompanying drawings, in which:

Fig. 1 is a medial vertical section; and

Fig. 2 is a section on line 2-4 of Fig. 1.

Referring now to the drawings, Figs. 1 and 2, I show a hollow body 5 having an end recess 8 within which the cutter head assembly to be described is mounted.

A spindle 8 is carried by the body, on which the hub portion 9 of a cylindrical outer cutter head in is rotatably mounted, the cutter head l having perforations ll adapted to pass whiskers.

Nested in axial alinement and end to end in the outer cutter head Hi, there are two cylindrical inner cutter elements IS, it, each having perforations l1 adapted to register with perforations ll. Cutter element i is fixed on a shaft 20 as by a key 2|, while cutter element It is fixed by key 24 on a sleeve 23 ioumaled in the 2 body. A bevel gear 30 is secured on the outer end of sleeve 28 while an oppositely disposed bevel gear 32 is secured on shaft 20, both said ars being driven by a bevel gear 35 driven by a flexible shaft 88 from a conventional electric motor 31 mounted in the hollow body. The outer end of the shaft 20 is iournaled in the body.

From the foregoing description it will be apparent that inasmuch as the gears 30, 32 are driven in opposite directions, the inner cutter elements I5, It are likewise driven in opposite directions so that although the peripheral portions of both inner cutter elements engage the inner surface of the outer cutter head with some friction, the tendency of each of the inner cutter elements to drag the outer cutter head is neutralized by the opposite rotational movement of the other inner cutter element, so that the outer cutter head remains stationary until pressed against and freely rolled over the skin surface during the shaving operation. As the outer cutter head is so rolled over the skin, whiskers on the face enter through the perforations ii and into the perforations in the inner cutter elements and are severed by the latter, which are driven to rotate relative to the outer cutter head.

While, in the foregoing, I have resorted to my invention, I wish it to be understood that I have done so merely to make my invention understood and that I do not limit my invention to such details. On the contrary, my invention is only to be limited as appears in the appended claims.

I claim:

1. A dry shaver comprising: a body, a pair of coaxial inner cutter elements disposed end to end and rotatably mounted in the body, a perforated cylindrical outer cutter head mounted for rotating movement about the inner cutter elements and power means operatively connected to the inner cutter elements to rotate the same in opposite directions relative to each other .whereby to neutralize drag of the inner cutter elements on the outer cutter head, said inner cutter elements and said outer cutter head having cooperating cutting edge portions.

2. In a dry shaver having a body, a spindle mounted in the body, an outer cylindrical perforated cutter head rotatably mounted on said spindle, a shaft journalled in the body coaxial with and disposed oppositely to the spindle, a sleeve rotatably mounted on and coaxial with the shaft, a pair of inner cutter elements dismentovertheskinoitheusenspeiroiinner cutter elements disposed end to end and nested in the outer head, and means operativeiy connectin: the inner cutter elements to the, power means, comprising a shaft iournelled in the body and fixed to one of the inner cutter elements, a. bevel sear fixed on said shaft. a. sleeve rotatably mounted on the shaft and fixed to the other inner cutter element, n bevel :esr dad on the sleeve and disposed opposite the otherinaly connecting the power means to the third bevel sear.

i 'T 1:. man. i sermons crrnn The following references are of record in the tile of this patent:

UNITED STATES PATENTS Name Date Page Aug. 15, 1

Number 

